Denise has $ 280 in her savings account . She wants to save at least $ 800 . Write an inequality to determine how much more money , d , Denise must save to reach her goal . a ) 800 + d is greater than or equal to 280 b ) 280 + d is greater than or equal to 800 ) 280 + d is less than or equal to 800 d ) 800 + d is less than or equal to 280